Glue dispenser



F. c. RODMAN ET AL Dec. 28, 1948.

GLUE DISPENSER 2 Sheets-Sheet 1 Filed April 30, 1946 INyENTR fia/vvc/iL. POO/VAN BWMZS 5. E/VGEL.

ATTORNEY Dec. 28, 1948.

F. c. RODMAN ET AL BY JAMES A". [NGEL Patented Dec. 28, 1948 Francis C.Rodman, Garden City, and James Engel, To'ttenville, Staten IslaniLN.Y.,a'ssignms to American Seal-Kan Corporation ofDelaware, Wilmington,Del., a corporation of Delaware Application April 30, 1946, SeriaYNo.666,152

i Claims. '1

This invention "relates to a device for applying a-spot of anadhesive-materialrsuch as glue to a paper wrapper.

The invention as illustrated herein, is shown as used'in connection withthe wrapping'of nested stacks of milk bottle caps in the mannerdisclosed in the Goodwin Patent No. 2,266,547. The caps are then appliedto the mouth of milk bottles by capping machines such as are shown inthe Daniels Patent No. 2,068,165 and the Goodwin et al. Patent No.2,325,163. These patents each show a capping machine having acylindrical mag: azine adaptedto receive a stackof milk bottle caps fromwhich they are automatically fed arid'applied to successive milk bottlesas they leave a filling machine. In commercial practice the stacks ofcaps are wrapped {by rolling the same in wrapping paper in such awaythat'the wr'a'pper may be'sealed by a spot of adhesiveapplied to thewrapper adjacent one of the "corners thereof. Generally a definitenumber :of 'caps are wrapped in each wrappenand they are shipped andstored in wrapped stacks. Inloading the'capping machine a wrapped stackof caps is placed in the magazine with the corner of the wrapper beyondthe sealing sp'ot extending out through a longitudinal slot in themagazine. The wrapper is removed by grasping this corner. and pulling onthe same to break the seal and to un'roll the wrapper from the stack ofcaps, leaving the stack of caps in the magazine in condition for use.The caps are thus charged into the magazine without being touched by theoperator; an important sanitary consideration in 'modern dairies. 5

Heretofore the adhesive was applied to the wrapping paper either by asmall brush or by mechanism of the type such as :showndn 'ithe DorschPatent No. 2,156,804. Applying the adhesive by a brush is a-slow processand it is practically impossible to apply the-same amount of adhesive tosuccessive sheets of wrapping vpaper. Either toomuch or too littleadhesive is generally applied. When too vmuch -is applied the seal isnot readily broken-after astack'has been inserted in the capping'machinemagazine, and whentoo little is applied the seal frequently breaks"during handling. Prior known adhesive ap-plying mechamsms -are.rathercomplicated andare not too efficient in operation.

The principal object of the present invention is to provide an apparatusfor applying spot'sof glue to-sheets of wrapping ,paper whichis simpleand efficient in operation and which will always apply the same amountof glue" to successive sheets of wrapping :paper presented thereto.

Other and more specific objects of the invention will be apparent fromthe following specification and the accompanying drawings forming a partthereof wherein:

Fig. 1 is a plan view showing a wrapping table and my improved gluespotter associated therewith;

Fig. 2 is a front elevation thereof;

Fig. 3 is a central vertical section through our improved glue spottershowing the various parts thereof in their normal inoperative position;

Fig. 4 is a viewsimilar to Fig. 3 showing the various parts in theposition they assume after the initial operative movement of the device;and

Fig. 5 is a view similar to Figs. 3 and 4 showing the device after ithas been brought into contact with a sheet of wrapping paper to apply aspot of glue thereto.

Referring now to the drawing by reference characters, the numeral Iindicates generally our improved glue spotter which when used inconnection with the wrapping of nested stacks 'of bottle caps is usuallyassociated with a wrapping table 2 as shown in Figs. 1 and 2. The table2 has agroove or trough 3 extending from side to side thereof, and apair of spaced transversely extending guide rails 4 and 5 adjustablysecured to the upper surface thereof.

In wrapping stacks of bottle caps a rectangular sheet of wrapping paperBis first placed diagonally upon the table 2 with one corner 1 thereofbeneath the glue spotter I, as shown in Fig. 1. A stack of caps, thelength of the stack being equal to the distance between the rails 4 and5, is then laid upon the wrapping paper over the groove or trough 3 andis pressed down thereinto. The lower corner 8 of the wrapper is thenfolded up over the stack, partially enclosing it, after which theopposite corners 9 and I6 of the wrapper are-folded in toward each otherenclosing'the ends of the stack. The glue spotter l is then operated toplace a spot of glue on the corner "I of the wrapper and the stack withthe wrapper thus folded thereabout is rolled upon the table 2 until thespot of glue contacts the underlying wrapper and effectively seals itabout the stack. The manner in which the wrapper is folded and rolledabout a stack of caps is clearly disclosed in the aforesaid GoodwinPatent No. 2,266,547.

Our improved glue spotter l includes a glue pot H having its upper endclosed by a cover l2 which is removably secured thereto by screw l3extending upwardly from the 'pot ll through bayonet slots 14 in the*cover. It is supported ln operative relation to the table 2 by abracket 15 having a vertical bore I6 therethrough in which the glue potI I is slidably mounted. The bracket I is rigidly secured to either thetable 2 or to any suitable support adjacent thereto.

A disc I'I having a transversely extending slot I8 formed therein ismounted within the upper end of the glue pot II upon an annular shoulderI9. Formed integrally with and projecting downwardly from the disc I? isa sleeve which acts as a guide for a valve stem 2I slidably mountedtherein. A frustro-conical valve 22 which is pinned to the lower reducedend of the valve stem 2| is adapted to open and close a complementaryshaped port 23 in a block 24 which is disposed in the lower end of theglue pot II. The valve 22 and the block 2d are made of hardened metal toresist wear due to operation. The valve stem 2| has an annular flange 25formed integrally therewith a short distance below the upper end 26thereof, and immediately below the flange 25 the valve stem l I has aslot 21 therethrough.

The upper end 23 of the valve stem and the flange 25 extend into anaxial recess 28 in the lower end of a cam 29. The cam 29 has acylindrical portion 30 which is slidably mounted in a centrally disposedaperture 3i through the cover I2. A knob 32 is pinned to the cam 29 asindicated at 33. A coiled spring 34 mounted in a bore 35 in the upperend of the valve stem 2I biases the valve stem 2I and valve 22downwardly to close the port 23 and at the same time urges the cam 29upwardly in the aperture 3|.

A pair of opposed bell crank levers 36 each having a vertical arm 31 anda horizontal arm 38 are pivotally supported in the slot I8 by pins 39.The horizontal arms 38 of the bell crank lever extend into the slot 21,through the valve stem 21, and the vertical arms 3'l of the bell cranklever are in contact with the frustro-conioal cam surface 40 of the cam29.

A coiled spring II disposed about the glue pot I I between an annularflange 42, about the upper end thereof, and the upper surface of thebracket I5 normally urges the device upwardly in the bore It to theposition shown in Fig. 3. A ring 4 3 adjustably secured about the gluepot II by a set screw 46 limits this upward movement of the device inthe bore I6.

Operation In operation, glue in liquid form is placed in the glue pot II beneath the disc II. This is done by loosening the screws I3, turningthe cover I2 until the screw heads are in alignment with the enlargedends of the bayonet slot I4 and then lifting the cover I2 and cam 29 01fby the knob 32. The disc I7 and the mechanism carried thereby are thenremoved and the glue inserted. These parts are then replaced. The spring34 will normally hold the valve 22 down, closing the port 23 andpreventing glue escaping. The wrapping paper is placed in properposition beneath the device and the knob 32 is depressed by theoperator. This depresses the cam 29 which through the frustro-conicalsurface 40 spreads the vertical arm 3'! of the bell crank levers 36 androcks the ends of the horizontal arms thereof upwardly. The upwardmovement of the ends of the bell crank arms 38 lifts the valve stem 2Iand valve 22, from the position shown in Fig. 3 to the position shown inFig. 4, opening the port 23 and allowing glue to flow into the annularspace between the valve 22 and the port 23 and about the lower flattenedend of the valve. Further depression of the knob 32 will move the devicedownwardly in the bore I6 against the upward pressure of the spring II,from the position shown in Fig. 4 to the position shown in Fig. 5 withthe lower end of the device in contact with the wrapping paper. A spotof glue, the size of the lower end of the port 23 will then be appliedto the wrapper. The operator then releases the knob 32 allowing thesprings 34 and II to return the various elements of the device to theposition shown in Fig. 3, ready for the next operation.

The device has been illustrated and described herein in connection withthe wrapping of nested stacks of bottle caps, but that is only for thepurposes of illustration as the device can be used equally well in manyother environments where it is desired to successively apply spots ofadhesive to articles.

From the foregoing it will be apparent to those skilled in this art thatwe have provided a simple and eflicient mechanism for carrying out theobjects of our invention; and it is to be understood that we are notlimited to the specific construction shown herein as variousmodifications may be made therein within the scope of the appendedclaims.

What is claimed is:

1. In a device of the character described the combination of a support,a glue pot reciprocally mounted in a bore in said support, an outletport in the lower end of said pot, a cover removably secured to theupper end of said pot, a cam reciprocally supported by said cover, adisc mounted in said pot, a pair of opposed bell crank levers pivotallysupported by said disc in operative relation to said cam and adapted tobe rocked about their pivots by the reciprocation of said cam, a valveoperative to open and close said port, and operative-connections betweensaid bell crank levers and said valve for lifting said valve in responseto downward movement of said cam.

2. In a device of the character described the combination of a support,a glue pot reciprocally mounted in a bore in said support, an outletport in the lower end of said pot, a cover removably secured to theupper end of said pot, a cam reciprocally supported by said cover, adisc mounted in said pot, a valve guide secured to said disc, a valvestem slidably mounted in said guide, a valve operative to open and closesaid port secured to the lower end of said valve stem, a pair of opposedbell crank levers pivotally supported by said disc in operative relationto said cam and adapted to be rocked about their pivots by thereciprocation of said cam, and operative connections between said bellcrank levers and the upper end of said valve stem.

3. In a device of the character described the combination of a support,a glue pot adapted to be moved manually in one direction reciprocallymounted in a, bore in said support, spring means about the upper end ofsaid pot operative to move said pot in the opposite direction, anadjustable stop limiting the movement of said pot effected by saidspring means, an outlet port in the lower end of said pot, a coverremovably secured to the upper end of said pot, a cam reciprocallysupported by said cover, a disc mounted in said pot, a valve guidesecured to said disc, a valve stem slidably mounted in said guide, avalve operative to openand close said port secured to the lower endof'said valve stem, a pair of opposed bell crank levers pivotallysupported by said disc in operative relation to said cam and adapted tobe rocked about their pivots by the reciprocation of REFERENCES CITEDsald cam, and operative connections between said bell crank levers andthe upper end of said valve The win fe en es are of record in the t fileof this patent:

4. In a device of the character described the 5 UNITED STATES PATENTScombination of a glue pot, an outlet port in the lower end of said pot,a valve plunger operative to Number Name Date open and close said port,a pair of opposed bell 2,201,516 Bede May 21, 1940 crank levers mountedin said pot and connected 2,252,542 Beer} 12, 1941 to operate said valveplunger, a cam mounted to 10 1264532 Gerhtzkl 1941 reciprocatevertically, and an actuating plunger 2,403,016 Noble July 2, 1946 forsaid cam extending above said pot for manual actuation, said cam havinga surface shaped to rock said bell crank levers to lift said valveplunger when said cam actuating plunger is de- 15 pressed.

FRANCIS C. RODMAN. JAIWES E. ENGEL.

